Barracuda Email Security Service IP address ranges based on the region you selected for your Barracuda Email Security Service:
Customers Using the Following Instances of the Barracuda Email Security Service Instance
US: 18.104.22.168/20 and 22.214.171.124/21
Ensure Connectivity and Redundancy
Follow these tips to ensure connectivity and redundancy:
- Open your firewall ports to allow the IP address ranges, based on your Barracuda Email Security Service instance
- (Optional) Configure your mail server or router to block inbound email not originating from your Barracuda Email Security Service IP address ranges.
- If you have a Barracuda Web Security Gateway or Barracuda Web Application Firewall: You might need to exempt ess.barracudanetworks.com from filtering.
- Exempt traffic coming from the Barracuda Email Security IP addresses from any kind of throttle or rate controls.